Why some sinkholes are almost perfectly round

Ive been noticing a lot of questions from people asking why sinkholes can appear as almost perfect circles. Answers and theories include HAARP and
other suspected sinister activities. In reality, there's actually a natural explanation

Sinkholes that collapse in such a fashion are known to geologists as "cover collapse" or "dropout" sinkholes. This type of sinkhole occurs in fine
grained soil or sedimentary, kind of like the karst beddrock and volcanic ash in the area of the Guatemala sinkhole.

Heavy rains and underground water running in conduits through fine grained sediment, often causes voids in the material. Occasionally, these voids
form into an arch shape. As time goes by, the tops of these arches are forced up and up by the water. When the arch reaches the surface, it collapses
into a near perfect hole.

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